A skeleton watch with a red enamel chapter ring, the Métiers d’Art Mécaniques Ajourées Skeleton Only Watch 2015 is a one of a kind wristwatch Vacheron Constantin has created to raise funds for charity.

The Métiers d’Art Mécaniques Ajourées are a trio of skeleton watches introduced by Vacheron Constantin last year, featuring open-worked movements inspired by the architecture of Gothic buildings. Ordinarily available with black, grey or blue enamelled chapter ring, the Métiers d’Art Mécaniques Ajourées gets a bright red enamel treatment for the unique Only Watch edition. The hand-enamelled chapter ring sits under skeletonised Roman numerals, with a subtle “Only Watch” logo at three o’clock indicating its provenance.

Skeletonised by hand to create curved forms on the open-worked bridges, the movement is then engraved, also by hand. Based on the in-house calibre 4400, the movement is hand-wound with a 65 hour power reserve. The 40mm case is white gold, and engraved “No. 1/1” on the back.

The Métiers d’Art Mécaniques Ajourées Skeleton will be sold on November 7, 2015 at an auction in Geneva under the aegis of Phillips, with all proceeds going towards research into Duchenne muscular dystrophy.